package com.giserpeng.ntripshare.ntrip.Tools.RTCM;

import java.text.DecimalFormat;

public abstract class RTCM {

    protected byte[] rawMsg;

    protected String binaryBuffer = "";

    protected final static char BIT1 = '1';

    protected long toSignedLong(String bits) {
        int position = 0;
        long answer = 0;

        for (int i = bits.length() - 1; i > 0; i--) {
            if (bits.charAt(i) == BIT1)
                answer += (long) Math.pow(2, position);
            position++;
        }
        if (bits.charAt(0) == BIT1)
            answer += (long) Math.pow(2, position) * -1;
        return answer;
    }

    protected int toSignedInt(String bits) {
        int position = 0;
        int answer = 0;

        for (int i = bits.length() - 1; i > 0; i--) {
            if (bits.charAt(i) == BIT1)
                answer += Math.pow(2, position);
            position++;
        }
        if (bits.charAt(0) == BIT1)
            answer += Math.pow(2, position) * -1;
        return answer;
    }

    protected int toUnsignedInt(String bits) {
        int n = bits.length();
        int decimal = 0;
        for (int d = 0; d < n; d++) {

            decimal = decimal << 1;

            if (bits.charAt(d) == '1') {
                decimal = decimal | 1;
            }
        }
        return decimal;
    }

    protected long toUnsignedLong(String bits) {
        long n = bits.length();
        long decimal = 0;
        for (int d = 0; d < n; d++) {

            decimal = decimal << 1;

            if (bits.charAt(d) == '1') {
                decimal = decimal | 1;
            }
        }
        return decimal;
    }

    protected int toIntS(String bits) {
        int response = toUnsignedInt(bits.substring(1));
        if (bits.charAt(0) == BIT1)
            response *= -1;

        return response;
    }

    protected String customFormat(String pattern, double value) {
        return new DecimalFormat(pattern).format(value);
    }

    protected String toBinaryString(byte n) {
        StringBuilder sb = new StringBuilder("00000000");
        for (int bit = 0; bit < 8; bit++) {
            if (((n >> bit) & 1) > 0) {
                sb.setCharAt(7 - bit, '1');
            }
        }
        return sb.toString();
    }

    protected void setToBinaryBuffer(byte[] bytes) {
        for (int i = 1; i < bytes.length; i++) {
            binaryBuffer += toBinaryString(bytes[i]);
        }
    }

    protected String getBits(int position, int length) {
        String response = "";
        for (int i = position; i < position + length; i++) {
            response += binaryBuffer.charAt(i);
        }
        return response;
    }

    public static short getShortFromArray(byte[] array, int index) {
        return (short) (((array[index] & 0xFF) << 8) | (array[++index] & 0xFF));
    }

    protected static final int[] crc24 = new int[]{
            0x000000, 0x864CFB, 0x8AD50D, 0x0C99F6, 0x93E6E1, 0x15AA1A, 0x1933EC, 0x9F7F17,
            0xA18139, 0x27CDC2, 0x2B5434, 0xAD18CF, 0x3267D8, 0xB42B23, 0xB8B2D5, 0x3EFE2E,
            0xC54E89, 0x430272, 0x4F9B84, 0xC9D77F, 0x56A868, 0xD0E493, 0xDC7D65, 0x5A319E,
            0x64CFB0, 0xE2834B, 0xEE1ABD, 0x685646, 0xF72951, 0x7165AA, 0x7DFC5C, 0xFBB0A7,
            0x0CD1E9, 0x8A9D12, 0x8604E4, 0x00481F, 0x9F3708, 0x197BF3, 0x15E205, 0x93AEFE,
            0xAD50D0, 0x2B1C2B, 0x2785DD, 0xA1C926, 0x3EB631, 0xB8FACA, 0xB4633C, 0x322FC7,
            0xC99F60, 0x4FD39B, 0x434A6D, 0xC50696, 0x5A7981, 0xDC357A, 0xD0AC8C, 0x56E077,
            0x681E59, 0xEE52A2, 0xE2CB54, 0x6487AF, 0xFBF8B8, 0x7DB443, 0x712DB5, 0xF7614E,
            0x19A3D2, 0x9FEF29, 0x9376DF, 0x153A24, 0x8A4533, 0x0C09C8, 0x00903E, 0x86DCC5,
            0xB822EB, 0x3E6E10, 0x32F7E6, 0xB4BB1D, 0x2BC40A, 0xAD88F1, 0xA11107, 0x275DFC,
            0xDCED5B, 0x5AA1A0, 0x563856, 0xD074AD, 0x4F0BBA, 0xC94741, 0xC5DEB7, 0x43924C,
            0x7D6C62, 0xFB2099, 0xF7B96F, 0x71F594, 0xEE8A83, 0x68C678, 0x645F8E, 0xE21375,
            0x15723B, 0x933EC0, 0x9FA736, 0x19EBCD, 0x8694DA, 0x00D821, 0x0C41D7, 0x8A0D2C,
            0xB4F302, 0x32BFF9, 0x3E260F, 0xB86AF4, 0x2715E3, 0xA15918, 0xADC0EE, 0x2B8C15,
            0xD03CB2, 0x567049, 0x5AE9BF, 0xDCA544, 0x43DA53, 0xC596A8, 0xC90F5E, 0x4F43A5,
            0x71BD8B, 0xF7F170, 0xFB6886, 0x7D247D, 0xE25B6A, 0x641791, 0x688E67, 0xEEC29C,
            0x3347A4, 0xB50B5F, 0xB992A9, 0x3FDE52, 0xA0A145, 0x26EDBE, 0x2A7448, 0xAC38B3,
            0x92C69D, 0x148A66, 0x181390, 0x9E5F6B, 0x01207C, 0x876C87, 0x8BF571, 0x0DB98A,
            0xF6092D, 0x7045D6, 0x7CDC20, 0xFA90DB, 0x65EFCC, 0xE3A337, 0xEF3AC1, 0x69763A,
            0x578814, 0xD1C4EF, 0xDD5D19, 0x5B11E2, 0xC46EF5, 0x42220E, 0x4EBBF8, 0xC8F703,
            0x3F964D, 0xB9DAB6, 0xB54340, 0x330FBB, 0xAC70AC, 0x2A3C57, 0x26A5A1, 0xA0E95A,
            0x9E1774, 0x185B8F, 0x14C279, 0x928E82, 0x0DF195, 0x8BBD6E, 0x872498, 0x016863,
            0xFAD8C4, 0x7C943F, 0x700DC9, 0xF64132, 0x693E25, 0xEF72DE, 0xE3EB28, 0x65A7D3,
            0x5B59FD, 0xDD1506, 0xD18CF0, 0x57C00B, 0xC8BF1C, 0x4EF3E7, 0x426A11, 0xC426EA,
            0x2AE476, 0xACA88D, 0xA0317B, 0x267D80, 0xB90297, 0x3F4E6C, 0x33D79A, 0xB59B61,
            0x8B654F, 0x0D29B4, 0x01B042, 0x87FCB9, 0x1883AE, 0x9ECF55, 0x9256A3, 0x141A58,
            0xEFAAFF, 0x69E604, 0x657FF2, 0xE33309, 0x7C4C1E, 0xFA00E5, 0xF69913, 0x70D5E8,
            0x4E2BC6, 0xC8673D, 0xC4FECB, 0x42B230, 0xDDCD27, 0x5B81DC, 0x57182A, 0xD154D1,
            0x26359F, 0xA07964, 0xACE092, 0x2AAC69, 0xB5D37E, 0x339F85, 0x3F0673, 0xB94A88,
            0x87B4A6, 0x01F85D, 0x0D61AB, 0x8B2D50, 0x145247, 0x921EBC, 0x9E874A, 0x18CBB1,
            0xE37B16, 0x6537ED, 0x69AE1B, 0xEFE2E0, 0x709DF7, 0xF6D10C, 0xFA48FA, 0x7C0401,
            0x42FA2F, 0xC4B6D4, 0xC82F22, 0x4E63D9, 0xD11CCE, 0x575035, 0x5BC9C3, 0xDD8538};

    public static byte[] crc24q(byte[] buf, int len, int crc) {
        for (int i = 0; i < len; i++) {
            crc = ((crc << 8) & 0xFFFFFF) ^ crc24[(crc >> 16) ^ (buf[i] & 0xFF)];
        }
        byte[] result = new byte[3];

        result[0] = (byte) (crc >> 16);
        result[1] = (byte) (crc >> 8);
        result[2] = (byte) (crc);

        return result;
    }

}

